Create minimum-consecutive-cards-to-pick-up.cpp

Author: kamyu104

C++/minimum-consecutive-cards-to-pick-up.cpp

@@ -0,0 +1,19 @@
+// Time:  O(n)
+// Space: O(n)
+
+// hash table
+class Solution {
+public:
+    int minimumCardPickup(vector<int>& cards) {
+        static const int INF = numeric_limits<int>::max();
+        unordered_map<int, int> lookup;
+        int result = INF;
+        for (int i = 0; i < size(cards); ++i) {
+            if (lookup.count(cards[i])) {
+                result = min(result, i - lookup[cards[i]] + 1);
+            }
+            lookup[cards[i]] = i;
+        }
+        return result != INF ? result : -1;
+    }
+};